How can I detect usb connection in Android 4.2?

Question

I used ACTION_MEDIA_MOUNTED and ACTION_MEDIA_UNMOUNTED to detect USB connection on Nexus 4, but I cannot receive any broadcast signal.

Here is my broadcast receiver code:

IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_MEDIA_MOUNTED);
filter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
filter.addDataScheme("file");

debugReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        if (Intent.ACTION_MEDIA_MOUNTED.equals(action)) {
            debugOn = true;
        } else if (Intent.ACTION_MEDIA_UNMOUNTED.equals(action)) {
            debugOn = false;
        }
    }
};
registerReceiver(debugReceiver, filter);

Any ideas? I also searched others questions; they said if I add

"filter.addDataScheme("file");"

I will get the signal, but I have tried and nothing was received.

Answer 1

Use UsbManager.ACTION_USB_DEVICE_ATTACHED and UsbManager.ACTION_USB_DEVICE_DETACHED for your intent filter.

To check for connection to PC use Intent.ACTION_BATTERY_CHANGED and onReceive intent.getInt(BatteryManager.EXTRA_PLUGGED) and see if the value is BatteryManager.BATTERY_PLUGGED_USB.